Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsDaijiro Kojima, Takahiro Sajima
Life of this patent
Estimating the term…
Abstract
A golf ball can include a core, a mid layer, and a cover. In the golf ball, a hardness Ho at a central point of the core, a core surface hardness Hs, a hardness H1 at a point to which a distance from the central point of the core can be equal to 25% of a radius of the core, a hardness H2 at a point to which a distance from the central point of the core can be equal to 75% of the radius of the core, a hardness Hm of the mid layer, and a hardness Hc of the cover can satisfy all of the following relational expressions: Ho ≤ H 1 ≤ H 2 ≤ Hs ( 1 ) Ho < Hs ( 2 ) ( Hm - Hc ) ≤ ( Hs - Ho ) ( 3 ) ( Hs - Hc ) ≤ ( Hm - Hs ) . ( 4 )
Claims20
A golf ball comprising:
- a spherical core,
- a mid layer positioned outside the core, and
- a cover positioned outside the mid layer, the golf ball satisfying the following relational expressions (1) to (4):
- Ho
- ≤
- H
-
- 1
- ≤
- H
-
- 2
- ≤
- Hs
- ,
- (
- 1
- )
- Ho
- <
- Hs
- ,
- (
- 2
- )
- (
- Hm
- -
- Hc
- )
- ≤
- (
- Hs
- -
- Ho
- )
- ,
- and
- (
- 3
- )
- (
- Hs
- -
- Hc
- )
- ≤
- (
- Hm
- -
- Hs
- )
- ,
- (
- 4
- )
- wherein
- Ho:
- Shore-C hardness at a central point of the core,
- Hs:
- Shore-C hardness at a surface of the core,
- H1:
- Shore-C hardness at a point to which a distance from the central point of the core is equal to 25% of a radius of the core,
- H2:
- Shore-C hardness at a point to which a distance from the central point of the core is equal to 75% of the radius of the core,
- Hm:
- Shore-C hardness of the mid layer, and
- Hc:
- Shore-C hardness of the cover,
- wherein a difference between Hm-H1 is not less than 37 and not greater than 42, and
- wherein a difference between Hc−H2 is not greater than 0 and not less than −10.
A method comprising:
- providing a golf ball including:
- a spherical core,
- a mid layer positioned outside the core, and
- a cover positioned outside the mid layer, the golf ball satisfying the following relational expressions (1) to (4):
- Ho
- ≤
- H
-
- 1
- ≤
- H
-
- 2
- ≤
- Hs
- ,
- (
- 1
- )
- Ho
- <
- Hs
- ,
- (
- 2
- )
- (
- Hm
- -
- Hc
- )
- ≤
- (
- Hs
- -
- Ho
- )
- ,
- and
- (
- 3
- )
- (
- Hs
- -
- Hc
- )
- ≤
- (
- Hm
- -
- Hs
- )
- ,
- (
- 4
- )
- wherein
- Ho:
- Shore-C hardness at a central point of the core,
- Hs:
- Shore-C hardness at a surface of the core,
- H1:
- Shore-C hardness at a point to which a distance from the central point of the core is equal to 25% of a radius of the core,
- H2:
- Shore-C hardness at a point to which a distance from the central point of the core is equal to 75% of the radius of the core,
- Hm:
- Shore-C hardness of the mid layer, and
- Hc:
- Shore-C hardness of the cover,
- wherein Hm-H1 is not less than 37 and not greater than 42, and
- wherein a difference between Hc−H2 is not greater than 0 and not less than −10.
Dependencies are inferred from the claim text.